Missouri defensive lineman Michael Sam crosses the finish line while running the 40-yard dash during pro day for NFL football representatives Thursday, March 20, 2014, in Columbia, Mo. (AP Photo/L.G. Patterson)

Missouri defensive lineman Michael Sam crosses the finish line while running the 40-yard dash during pro day for NFL football representatives Thursday, March 20, 2014, in Columbia, Mo. (AP Photo/L.G. Patterson)

Missouri defensive lineman Michael Sam, left, picks up Andrew Hill as he greets him during pro day for NFL football representatives Thursday, March 20, 2014, in Columbia, Mo. Hill is the son of associate head coach Andy Hill. (AP Photo/L.G. Patterson)

Missouri defensive lineman Michael Sam, center, dances as he jokes with teammates during pro day for NFL football representatives Thursday, March 20, 2014, in Columbia, Mo. (AP Photo/L.G. Patterson)